Mechanical shovel



Apr'1l23, 1929. F. ARCl -llBALD 1,710,564

- MECHANICAL SHOVEL Original Filed Nov. 22, 1926 v 2 Sheets-Sheet l IIIAp F. ARCHIBALD MECHANICAL SHOVEL Original Fild Nov. 22, 1926 2Sheets-Sheet 2 uni-run sm res] mm; orricn,

rnnnnnron ABCHZBALD, on WILMINGTON, i'LLin'ois ii' noztnnroen ST-IGVELApplication filed.vli'ovemberzzp1926,'Seria1 No. 150,113. fienewed March14, meg;

The present invention relates'to steun'i and order that the d PPcr maybe pul ed "forric shovels; such as include a dipper on wardly and,upwardly as usual during the the end of adippor stick opera d mechanicalscooping operation. The foregoing structure ly for scooping up thedirt, 7 1d dipper .hevs well known, being generally used n steam 5 ir arear door ar d to be opened 1. and electric shovels. I dumping thematerial into a car or other re-- in carrying out'the invention abracing dem l viceis provided between the dipper 9 and f object etthe'invention is to provide stickSn, and includes the toggle links 21pivnovel bracing niea etween the dipper and oted at their opposite ends,asat 22 and 23,

10 dipper stickfor in retaining the dipper in respectivel with thedipper and stickS predetermined position relatively to the stick andadapted to straighten out, as seen n Fig. duringthe scooping operation,and for tilting l for holding the dipper 9 in scooping posr the dipperrelatively to the stick during the tron relatively tothe stick 8 A link24% 1s dumping operationsg'so facilitate the connected to the i1oint25,of'the links 21,-and

15 scooping and dumpingoperations. I 1s p voted as at 26, to. one of thedoor arms iother oh' tis provide means for lini- 13, in order that whenthe door 12is-closcd, itino; the tilting uiovenient of the dipperrelathe link 2-1- will pull the links 21 downwardly tively to the stickduring the dumping operato straight llne position, therebyholdlngthe I Ilinks 21 in bracing posit on while the door 12 2 With the foregoing andother ob ects in is latched. This w ll maintain the dipper 9 view, whichwill be apparent as the (188C111)? In its most effective'position forscooplng up tioi'rproceeds, the invention resides'inthe'conthe dirt, andwhen the dipper s raised over struction and arrangement of parts, ashere1na car or other receptacle-for receiving the inaafter described andclaimed, it being under- "serial, and the door 2 is unlatehed so as tostood the changes can be made within the swing open, as seen inFig.2,thelink'24being scope of wh is claimed, without departing moved'upwardly will break the toggle-device froin the spirit of the invention.7 upwardly, as seen in Fig. 2, thereby tilting The invention isillustrated in the accom- 'the dipper 9 toward the stick 8. Thus, thepanying drawings, Wherein' bracing or toggle device is operated auto- 30Figure 1 is a side elevation of the improved matically by the closingand opening move- 80 I snovel construction showing the dipper door mentsof the door 12. l d V I In order to liinit the tilting movement of Fig.2 is a corresponding side elevation the dipper 9 during the dumpingoperation, a showing the dipp rv d or wung open, U-shaped stirrup 27 hasits terminals pivot- 35 Fig. 3 is a sectional detail on the line 33 allyengaging the pivot bolt 18 of the pulley of g I p lock 19, from whichthe dipper is suspended The improvementsare illustrated as being and rod28 is slidable through the interapplied to a steam or electric shovel ofconlned-iate portion of said stirrup and is conventional form, andincluding the boom 7 nectedby chain links 29 with an eye bolt 30 40through which the dipper stick'8 movable, engaging through the dipperstick 8. A being; projected downwardly and retract-ed coiled spring 31surrounds the rod 28 within by suitable ineans not shown) and the dipthestirrup 27 and is confined between said l per 9 is h ngedly connected asat'10, to the stirrup and a nut- 32 adjustable on the rod. forward orlower end of thestick. 8; The This spring provides a cushionto absorbhingedly connected to the dipper 9 11s at 14,, vided bet-ween the pivotbolt 18 and the the hinge 10. so that the door inay swing dipper stick 8will serve to limit the tilting downwardly and rearwardly when released,lnovenie t of the duper 9 during the dumpthe usual latch (not shown)provided opera ion, nns. .uch as theweight of the dipper 8 has a reardoor 12 carried by arms 13 shocks and jolts. The connection thus pro- 10 50 for holdino' said door closed and the door,v di iner and itscontents is divided betweenthe being unlutched as usual by theunlatching de bail l6 and the connection between the bolt vice 15, aswell known. A bail 16 connected 18 and stick, This will prevent thedipper with the sides of the dipper is connected by a from swingi toofar toward a vertical posielevis 17 with a pivot bolt 18 engaging a tionin order that thedipper may be dispulley block 19 suspended by the cable20, in charged conveniently into a car on the same level as the shovel,withoutspilling the dirt from the car or raising the dipper to anexcessive height above the car. The present improvements are especiallydesirable when using the shovel for filling cars on the same will limitthe backward tlltiDglllOVt-Bllleht of the dipper, and the spring 31yielding will prevent a sudden ]ar or 3011; such as might be injuriousto the mechanism.

The arrangement 01' thetoggle links 21 and connecting link 24 may besuch that when the door 12 is opened with the dipper in dischargingposition, said dipper may be substantially vertical, it being noted thatthe breaking oi the toggle from the position shown inl ig. 1 to theposition shown in Fig. 2 causes the dipper 'toswing upwardly toward avertical position to facilitate the discharge of the con tentsotthedipper.

,Having thus described the invention, what is claimed as new is:-

1. A device of the-character described comprising a dipperstick, adipper hinged thereto, a hinged door for the dipper,.a=toggleconnectionbetween the dipper and stick, and a connection between said toggleconnection and door for moving said toggle connection to straightenedout position when the door is closed, torbracing the dipper, and:torbreaking the toggle connection and tilting the dipper relatively tothe stick when the door is opened.

2. A device the character described comprising a dipper stick, a dipperhinged there to, a hinged door for the dipper, toggle links connected tothe dipper and stick,'and a link connecting said toggle linksand door,said links being so arranged that the togglelinks are moved tostraightened out position when the door is closed.

3. A. device of thecharacter described (30111-7 tilted relatively tosaid stick and to limit said tilting inoveinent thereof.

t. A device of the character de 'cribed comprising a dipper stick, adipper hinged thereto, a hinged door tor the dipper, bracing meansbetween the dipper and stick operably connected. to the door to tilt thedipper relatively to the stick when the door is opened,

means connected to the dipper to vdraw saine forwardly and upwardly, anda yieldable connection between saidineans and stick to assist insupporting thedipper when it is tilted relatively to the stick and toliinit the tilting movement thereof.

in testimony whereof l hereunto aliix my signature. 7

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